Magnetic fluid sealing device with multiple through-hole structure magnetic sources
A magnetic fluid sealing and magnetic source technology, applied in the direction of engine sealing, mechanical equipment, engine components, etc., can solve the problems of permanent magnet ring fracture, difficult processing, and weakened pressure resistance of magnetic liquid sealing devices, so as to reduce magnetic flux leakage Effect
Active Publication Date: 2022-06-17
BEIJING JIAOTONG UNIV +1
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Problems solved by technology
[0003] In some sealing occasions, in addition to the need to seal the airtight cabin and the external environment, there are also problems with the addition of magnetic fluid, data collection, positioning, and communication. Referring to the field of mechanical engineering, the first method that comes to mind is to process on the permanent magnet ring The through hole is connected, but because the through hole structure on the permanent magnet ring will weaken the pressure resistance of the magnetic liquid sealing device to a certain extent, and the commonly used NdFeB magnet is a brittle and hard material that is difficult to process, over-processing it It is easy to cause the permanent magnet ring to break, so the magnetic liquid seal has never had a similar structure
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[0016] The present invention will be further described below in conjunction with the accompanying drawings.
[0017] like figure 1 As shown, the magnetic fluid seal with a plurality of through-hole structure magnetic sources includes a housing, a left pole shoe ring, a right pole shoe ring and a permanent magnet ring; the left pole shoe ring, the permanent magnet ring and the right pole shoe ring are arranged on the inner wall of the casing, and there is a space between the inner circular surface of the left pole shoe ring, the right pole shoe ring and the outer circular surface of the shaft; the outer circular surface of the shaft is provided with a pole tooth , the pole teeth extend radially to the inner circular surfaces of the left pole shoe ring and the right pole shoe ring, and there is a gap between the pole teeth and the inner circular surfaces of the left pole shoe ring and the right pole shoe ring. Filled with magnetic fluid for sealing, the permanent magnet ring is...
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The invention relates to a magnetic fluid seal with a plurality of through-hole magnetic sources, which comprises a shell, a left pole shoe ring, a right pole shoe ring and a permanent magnet ring. The present invention proposes a design method in which a plurality of through holes are opened at the same time for an annular permanent magnet. This structure solves the problems of difficult machining of the permanent magnet ring, addition of magnetic liquid, data collection, positioning, and communication in the annular magnets commonly used in magnetic liquid sealing. In engineering, magnetic liquid can be injected through the through hole, or data monitoring devices, such as temperature sensors, speed sensors, magnetometers, etc., can be placed at the through hole for data collection; or threads can be processed at the through hole to meet the fixing requirements of the ring magnet. Need, on the one hand, the magnetic liquid seal can well solve the above-mentioned problems in engineering, on the other hand, it can lighten the permanent magnet structure and reduce the load on the rotating shaft.
Description
technical field [0001] The invention belongs to the field of mechanical engineering sealing, in particular to a magnetic fluid sealing device with a plurality of through-hole structure magnetic sources. Background technique [0002] Magnetic fluid seal is to use permanent magnets to generate magnetic field force in the sealing gap to firmly fix the magnetic fluid in the sealing gap to resist the pressure difference on both sides, so as to achieve the sealing effect. [0003] In some sealing occasions, in addition to the need to seal the sealed chamber and the external environment, there are also problems of adding magnetic liquid, data collection, positioning, and connection. Referring to the field of mechanical engineering, the first method that comes to mind is to process the permanent magnet ring. Connecting through holes, but because the through hole structure on the permanent magnet ring will weaken the pressure resistance of the magnetic liquid sealing device to a cert...
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IPC IPC(8): F16J15/43
CPCF16J15/43
Inventor 刘嘉伟李德才
Owner BEIJING JIAOTONG UNIV